Does this rule apply to Currency exchange only?
2. Do not have more than one active sales topic. If you need more visibility, you can bump your thread every 24 hours.
Or does it apply to every subcategory of Marketplace? I really think it should, or there should be a limit, even if it's not just 1. Let me explain my point this way:

At least users should be allowed to bump every 24h
only one of their threads and link all the others from there.